Compositions: coating or plastic – Coating or plastic compositions – Marking
Patent
1997-11-17
1999-05-25
Klemanski, Helene
Compositions: coating or plastic
Coating or plastic compositions
Marking
106 3161, C09D 1102, C09D 1112
Patent
active
059066784
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a hot melt colored ink, and more particularly, to a hot melt colored ink containing phytosterol and/or a derivative of phytosterol suitable for use in a heat transfer layer of a heat transfer recording material.
BACKGROUND ART
In a heat transfer system using a thermal printing head, a substrate comprising a paper or a heat-resistant plastic film, such as a polyester film, having a thickness of about 10 .mu.m and coated with a hot melt colored ink containing a coloring agent, such as a pigment, is heated with a thermal printing head from the side of the substrate to soften and melt the ink, whereby the hot melt ink is transferred to the surface of a receiving material such as a receptive paper.
The conventional hot melt colored ink used in a heat transfer layer of a heat transfer recording material generally contains an ink binder comprising a wax having a melting point of 50.degree. C. to 90.degree. C., a dispersant and a thermoplastic resin such as an ethylene-vinyl acetate copolymer (EVA resin) and a coloring component such as a pigment and a dye. In the conventional hot melt colored ink, EVA resin is an essential component as the ink binder. Consequently, irritating odor generated during the process of mixing and kneading components under heating to produce the hot melt colored ink causes deterioration in work place. Further, EVA resin tends to increase cost for producing a hot melt colored ink.
As a binder for a hot melt colored ink, waxes have been employed. Such waxes include natural waxes such as carnauba wax, candelilla wax, bees wax and montan wax, mineral oil type waxes such as paraffin wax and microcrystalline wax, and synthetic waxes such as polyethylene wax and oxidation wax. Since all of these waxes have poor compatibility with other components, low molecular weight and low melt viscosity, the conventional ink binder has insufficient solubility and dispersibility for a coloring pigment. Furthermore, a hot melt colored ink containing a wax as an ink binder has disadvantages such as grimes, poor sharpness, blurs and stains because of low hardness (needle penetration) and low melt viscosity of the ink. The hot melt colored ink containing a wax has also disadvantages such that the peel strength, unevenness and performance (quality and resolution of the transfer recorded image) of the image printed on a recording material (a receptive paper) are insufficient.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a novel hot melt colored ink that eliminates the abovementioned disadvantages.
The primary object of the present invention is to improve the dispersibility of a coloring component such as carbon black and a pigment in a hot melt colored ink by adding phytosterol and/or a derivative thereof to the hot melt colored ink, and obtain a novel hot melt colored ink with superior affinity and adhesiveness to a recording material such as a paper as compared to a conventional hot melt colored ink containing linear waxes.
Second, according to the present invention, a novel hot melt colored ink is provided, which is excellent in strength of transferred image or print transferred on a surface of a recording material (receptive paper), by employing a polyethylene resin which is not expensive but has not been considered to be usable as a binder so far.
Thirdly, according to the present invention, a polyethylene resin can be employed, in place of EVA resin, whereby irritating odor to be generated during the process of mixing and kneading components under heating to produce hot melt colored ink can completely be prevented to improve environmental conditions in work place.
Fourth, according to the present invention, a hot melt colored ink having good durability against oxidation deterioration and light deterioration, excellent adhesiveness to a recording material (receptive paper and the like) can be provided. According to the present invention, various disadvantages found in the conventional ink, such as grimes, patchiness, u
REFERENCES:
patent: 4828922 (1989-05-01), Koshizuka et al.
patent: 5259873 (1993-11-01), Fujioka
patent: 5427611 (1995-06-01), Shirota et al.
patent: 5531819 (1996-07-01), Sawada
Fujiyama Jitsunori
Kimura Masakazu
Naito Nobuhiko
Takamura Yoshio
Chori Co., Ltd.
Dai Nippon Printing Co. Ltd.
Klemanski Helene
Polycol Color Industries Co., Ltd.
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